About Optics & Photonics TopicsOSA Publishing developed the Optics and Photonics Topics to help organize its diverse content more accurately by topic area. This topic browser contains over 2400 terms and is organized in a three-level hierarchy. Read more.

Topics can be refined further in the search results. The Topic facet will reveal the high-level topics associated with the articles returned in the search results.

Abstract

We present the first experimental demonstration of the astigmatic phase retrieval technique, in which the diffracted wavefield is distorted by cylindrical curvature in two orthogonal directions. A charge-one vortex, a charge-two vortex, and a simple test image are all correctly reconstructed.

Figures (9)

The steps of the algorithm. The wavefunctions at the lens plane (L) and at the detector plane (D) are modified by the functions between, which are explained in the accompanying text. Arrows indicate the order of the functions.

The set-up for the experiments; where l is the distance between the hologram or sample and the lens, and z is the distance between the exit surface of the lens and the CCD chip in the camera, and f is the focal length of the lens.

Experimental diffraction data from an array of apertures. Where: (a), (b) and (c) are the recorded intensities of the three propagated wavefunctions. (d) Microscope image of the sample and (e) with it blurred to have a resolution comparable to the expected best resolution possible from the diffraction data. (e) Intensity of the reconstructed wavefunction at the lens plane (Media 4).